In 1976, cellist
Mstislav Rostropovich commissioned twelve composers (
Conrad Beck,
Luciano Berio, Boulez,
Benjamin Britten,
Henri Dutilleux,
Wolfgang Fortner,
Alberto Ginastera,
Cristóbal Halffter,
Hans Werner Henze,
Heinz Holliger,
Klaus Huber and
Witold Lutosławski) to write pieces celebrating the 70th birthday of conductor and patron
Paul Sacher. The composers were asked to base their works on the
Sacher hexachord, in which Sacher's last name is spelled out as musical notes: eS-A-C-H-E-Re is translated into E♭-A-C-B-E-D (Es is E♭ in German; H is B♮ in German; Re is D♮ in French). These compositions were collected under the title
12 Hommages à Paul Sacher, and published together in the book
Dank an Paul Sacher (Thanks to Paul Sacher). The complete cycle was not performed in its entirety until 9 May 2011, at a concert by cellist
František Brikcius at the
Convent of Saint Agnes, part of the
National Gallery Prague, Czech Republic. Its title is a
portmanteau word that combines "messages" and "esquisse" ("sketch" in English). The work's pitch material is based on rotations of the Sacher hexachord, while its rhythms are derived from the letters of Sacher's last name represented in
Morse code. Boulez biographer
Dominique Jameux noted the work's "clearly perceptible design," while musicologist
Susan Bradshaw described it as "a birthday telegram written in an easily decipherable musical code that relates everything to the single cell of an initiating series drawn from the letters of its dedicatee's name." Boulez would go on to base a series of compositions on the Sacher hexachord:
Répons (1980, revised and expanded 1982 and 1984);
Dérive 1 (1984);
Incises (1994, revised and expanded 2001); and
Sur Incises (1996–98). ==Premiere and publication==